gewichtung is the weight of an object in kilos.
f.e.
viewdummy = obj_create(NULL, vector(0,0,-40), nullvector, 80, NULL);
create a CUBE_MDL Object at given position with nullvector as rotation, a weight of 80kg and default jumpspeed (50)
viewdummy = obj_create(NULL, vector(0,0,-40), nullvector, 80, 70);
Same, but sets jumpspeed to 70.